If it was my tree, since the cambium looks like it’s still attached and in good shape, I would try to wood glue the woody tissue back together then join the sides back together with at least two bolt-washer-tree-washer-nut combos. The bots would be there permanently. If you attempt this fix, do not under any circumstance sever the cambium at the bottom of the split. You’ll likely need a second pair of hands to help you.
It may end up looking like a franken-tree, but I think you have a good chance to save the limb.
Here’s another related thread from @BobVance.